I second neileg.
One of your valves has apparently come loose or broke, and fell into the combustion chamber. -Not good!
If that's in fact what happened, you are looking at a major engine repair.
You can save at bunch of $$ finding a good used engine instead of repairing the old one.
Never criticize someone until you've walked a mile in his shoes. That way, when you do, you're a mile away -and you have his shoes!
'86 300E optically converted to '95 E300 (Sold)
-Blauschwarz on silver
-17" AMG & 15" AMG for winter